Support LTX2 Tiny VAE (taeltx_2)

comfy/sd.py

@@ -635,14 +635,13 @@ def estimate_memory(shape, dtype, num_layers = 16, kv_cache_multiplier = 2):
                 self.upscale_index_formula = (4, 16, 16)
                 self.downscale_ratio = (lambda a: max(0, math.floor((a + 3) / 4)), 16, 16)
                 self.downscale_index_formula = (4, 16, 16)
-                if self.latent_channels == 48: # Wan 2.2
+                if self.latent_channels in [48, 128]: # Wan 2.2 and LTX2
                     self.first_stage_model = comfy.taesd.taehv.TAEHV(latent_channels=self.latent_channels, latent_format=None) # taehv doesn't need scaling
-                    self.process_input = lambda image: (_ for _ in ()).throw(NotImplementedError("This light tae doesn't support encoding currently"))
+                    self.process_input = self.process_output = lambda image: image
                     self.process_output = lambda image: image
                     self.memory_used_decode = lambda shape, dtype: (1800 * (max(1, (shape[-3] ** 0.7 * 0.1)) * shape[-2] * shape[-1] * 16 * 16) * model_management.dtype_size(dtype))
                 elif self.latent_channels == 32 and sd["decoder.22.bias"].shape[0] == 12: # lighttae_hv15
                     self.first_stage_model = comfy.taesd.taehv.TAEHV(latent_channels=self.latent_channels, latent_format=comfy.latent_formats.HunyuanVideo15)
-                    self.process_input = lambda image: (_ for _ in ()).throw(NotImplementedError("This light tae doesn't support encoding currently"))
                     self.memory_used_decode = lambda shape, dtype: (1200 * (max(1, (shape[-3] ** 0.7 * 0.05)) * shape[-2] * shape[-1] * 32 * 32) * model_management.dtype_size(dtype))
                 else:
                     if sd["decoder.1.weight"].dtype == torch.float16: # taehv currently only available in float16, so assume it's not lighttaew2_1 as otherwise state dicts are identical

comfy/taesd/taehv.py

@@ -112,7 +112,8 @@ def apply_model_with_memblocks(model, x, parallel, show_progress_bar):
 
 
 class TAEHV(nn.Module):
-    def __init__(self, latent_channels, parallel=False, decoder_time_upscale=(True, True), decoder_space_upscale=(True, True, True), latent_format=None, show_progress_bar=True):
+    def __init__(self, latent_channels, parallel=False, encoder_time_downscale=(True, True, False), decoder_time_upscale=(False, True, True), decoder_space_upscale=(True, True, True),
+                 latent_format=None, show_progress_bar=False):
         super().__init__()
         self.image_channels = 3
         self.patch_size = 1
@@ -124,48 +125,62 @@ def __init__(self, latent_channels, parallel=False, decoder_time_upscale=(True,
         self.process_out = latent_format().process_out if latent_format is not None else (lambda x: x)
         if self.latent_channels in [48, 32]: # Wan 2.2 and HunyuanVideo1.5
             self.patch_size = 2
+        elif self.latent_channels == 128: # LTX2
+            self.patch_size, self.latent_channels, encoder_time_downscale, decoder_time_upscale = 4, 128, (True, True, True), (True, True, True)
+
         if self.latent_channels == 32: # HunyuanVideo1.5
             act_func = nn.LeakyReLU(0.2, inplace=True)
         else: # HunyuanVideo, Wan 2.1
             act_func = nn.ReLU(inplace=True)
 
         self.encoder = nn.Sequential(
             conv(self.image_channels*self.patch_size**2, 64), act_func,
-            TPool(64, 2), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
-            TPool(64, 2), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
-            TPool(64, 1), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
+            TPool(64, 2 if encoder_time_downscale[0] else 1), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
+            TPool(64, 2 if encoder_time_downscale[1] else 1), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
+            TPool(64, 2 if encoder_time_downscale[2] else 1), conv(64, 64, stride=2, bias=False), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func), MemBlock(64, 64, act_func),
             conv(64, self.latent_channels),
         )
         n_f = [256, 128, 64, 64]
-        self.frames_to_trim = 2**sum(decoder_time_upscale) - 1
+
         self.decoder = nn.Sequential(
             Clamp(), conv(self.latent_channels, n_f[0]), act_func,
-            MemBlock(n_f[0], n_f[0], act_func), MemBlock(n_f[0], n_f[0], act_func), MemBlock(n_f[0], n_f[0], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[0] else 1), TGrow(n_f[0], 1), conv(n_f[0], n_f[1], bias=False),
-            MemBlock(n_f[1], n_f[1], act_func), MemBlock(n_f[1], n_f[1], act_func), MemBlock(n_f[1], n_f[1], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[1] else 1), TGrow(n_f[1], 2 if decoder_time_upscale[0] else 1), conv(n_f[1], n_f[2], bias=False),
-            MemBlock(n_f[2], n_f[2], act_func), MemBlock(n_f[2], n_f[2], act_func), MemBlock(n_f[2], n_f[2], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[2] else 1), TGrow(n_f[2], 2 if decoder_time_upscale[1] else 1), conv(n_f[2], n_f[3], bias=False),
+            MemBlock(n_f[0], n_f[0], act_func), MemBlock(n_f[0], n_f[0], act_func), MemBlock(n_f[0], n_f[0], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[0] else 1), TGrow(n_f[0], 2 if decoder_time_upscale[0] else 1), conv(n_f[0], n_f[1], bias=False),
+            MemBlock(n_f[1], n_f[1], act_func), MemBlock(n_f[1], n_f[1], act_func), MemBlock(n_f[1], n_f[1], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[1] else 1), TGrow(n_f[1], 2 if decoder_time_upscale[1] else 1), conv(n_f[1], n_f[2], bias=False),
+            MemBlock(n_f[2], n_f[2], act_func), MemBlock(n_f[2], n_f[2], act_func), MemBlock(n_f[2], n_f[2], act_func), nn.Upsample(scale_factor=2 if decoder_space_upscale[2] else 1), TGrow(n_f[2], 2 if decoder_time_upscale[2] else 1), conv(n_f[2], n_f[3], bias=False),
             act_func, conv(n_f[3], self.image_channels*self.patch_size**2),
         )
-        @property
-        def show_progress_bar(self):
-            return self._show_progress_bar
 
-        @show_progress_bar.setter
-        def show_progress_bar(self, value):
-            self._show_progress_bar = value
+        self.t_downscale = 2**sum(t.stride == 2 for t in self.encoder if isinstance(t, TPool))
+        self.t_upscale = 2**sum(t.stride == 2 for t in self.decoder if isinstance(t, TGrow))
+        self.frames_to_trim = self.t_upscale - 1
+        self._show_progress_bar = show_progress_bar
+
+    @property
+    def show_progress_bar(self):
+        return self._show_progress_bar
+
+    @show_progress_bar.setter
+    def show_progress_bar(self, value):
+        self._show_progress_bar = value
 
     def encode(self, x, **kwargs):
+        x = x.movedim(2, 1)  # [B, C, T, H, W] -> [B, T, C, H, W]
         if self.patch_size > 1:
+            B, T, C, H, W = x.shape
+            x = x.reshape(B * T, C, H, W)
             x = F.pixel_unshuffle(x, self.patch_size)
-        x = x.movedim(2, 1)  # [B, C, T, H, W] -> [B, T, C, H, W]
-        if x.shape[1] % 4 != 0:
-            # pad at end to multiple of 4
-            n_pad = 4 - x.shape[1] % 4
+            x = x.reshape(B, T, C * self.patch_size ** 2, H // self.patch_size, W // self.patch_size)
+        if x.shape[1] % self.t_downscale != 0:
+            # pad at end to multiple of t_downscale
+            n_pad = self.t_downscale - x.shape[1] % self.t_downscale
             padding = x[:, -1:].repeat_interleave(n_pad, dim=1)
             x = torch.cat([x, padding], 1)
         x = apply_model_with_memblocks(self.encoder, x, self.parallel, self.show_progress_bar).movedim(2, 1)
         return self.process_out(x)
 
     def decode(self, x, **kwargs):
+        x = x.unsqueeze(0) if x.ndim == 4 else x  # [T, C, H, W] -> [1, T, C, H, W]
+        x = x.movedim(1, 2) if x.shape[1] != self.latent_channels else x  # [B, T, C, H, W] or [B, C, T, H, W]
         x = self.process_in(x).movedim(2, 1)  # [B, C, T, H, W] -> [B, T, C, H, W]
         x = apply_model_with_memblocks(self.decoder, x, self.parallel, self.show_progress_bar)
         if self.patch_size > 1:

latent_preview.py

@@ -11,7 +11,7 @@
 default_preview_method = args.preview_method
 
 MAX_PREVIEW_RESOLUTION = args.preview_size
-VIDEO_TAES = ["taehv", "lighttaew2_2", "lighttaew2_1", "lighttaehy1_5"]
+VIDEO_TAES = ["taehv", "lighttaew2_2", "lighttaew2_1", "lighttaehy1_5", "taeltx_2"]
 
 def preview_to_image(latent_image, do_scale=True):
         if do_scale:

nodes.py

@@ -700,7 +700,7 @@ def load_lora_model_only(self, model, lora_name, strength_model):
         return (self.load_lora(model, None, lora_name, strength_model, 0)[0],)
 
 class VAELoader:
-    video_taes = ["taehv", "lighttaew2_2", "lighttaew2_1", "lighttaehy1_5"]
+    video_taes = ["taehv", "lighttaew2_2", "lighttaew2_1", "lighttaehy1_5", "taeltx_2"]
     image_taes = ["taesd", "taesdxl", "taesd3", "taef1"]
     @staticmethod
     def vae_list(s):